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Finding the Fourth Proportional to 788.28, 1,086.76 and 678.92

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Solution

The fourth proportional to 788.28, 1,086.76 and 678.92 is: 935.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.28 : 1,086.76 = 678.92 : x
  2. Step 2: Convert to fraction form
    788.28/1,086.76 = 678.92/x
  3. Step 3: Cross multiply
    788.28x = 1,086.76 × 678.92
  4. Step 4: Simplify right side
    788.28x = 737,823.10
  5. Step 5: Solve for x
    x = 737,823.10/788.28
  6. Step 6: Final answer
    x = 935.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.